Improvement in steam-boilers



J. HARSHMAN'.

Domestic Boiler.

Patented July 3, 1855.

N. PETERS Pmm-umo n inn Washin ton. I10

UNITED STATES PATENT OFFICE.

JACOB HARSHMAN, OF DAYTON, OHIO.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 1 3,168, dated July 3,1855.

of this specification, in which Figure 1 is a front view of asteam-boiler,

with my improvement applied to it. Fig. 2 is a transverse verticalsection of the same. Fig. 3 is a longitudinal vertical section of thesame. Fig. 4 is a side view of the same.

This invention relates to a new and useful improvement in theconstruction of steamboilers, stoves, and all metallic heat-diffusingapparatuses.

The nature of the invention consists in inclosing or covering theexterior surfaces of steam-boilers, stoves, &c., wholly or partiallywith sheet-copper.

A steam-boiler is represented in the drawings with my improvementapplied to it.

A represents the boiler, which may be constructed in any of theknownforms, the cylindrical form being represented in the drawings.

B is the fire chamber underneath the boiler A.

The boiler A is covered with sheet-copper O, the covering extending overits upper part and down the sides as far as the fire-lines, as clearlyshown in Figs. 2 and 3. The copper does not fit closely to theoutersurface of the boiler. A space, a, is allowed between. (See Figs. 2and 3.) The exterior surfaces of stoves, drums, and all heat-diffusingdevices I also cover with sheet-copper, or such portions of the exteriorsurfaces as are exposed to heat.

By the above improvement I maintain that in the case of steam-boilersthe copper covering holds a peculiar government over the elements withina boiler in aflinity with certain external elements; that in certainlocalities there are elements surrounding the steamroom of boilers thatwill under certain conditions of heat unite in explosive proportion withthe elements within, which results in terrific explosions. The coppercovering 0 will conduct off the excess of caloric in such cases, whichprevents the explosive union of these gases, so that violent explosionswill be prevented. Ruptures, however, may take place if the pressure israised beyond the strength of the boiler-plates; but such will seldom bethe case. Besides, notice of ruptures is always obtained in consequenceof leakages.

By applying the copper covering to stoves or any heat-diffusing deviceor apparatus the surrounding atmosphere is prevented from being vitiatedby deleterious gases which emanate from the ordinary iron stoves in use.The heat is radiated more uniformly throughout a roomthat is, the heatnear the stove is not very much greater than that at the more remoteparts of the room. The improvement is also well adapted to airheatingstoves, whereby pure and agreeable air may be conveyed to differentapartments.

Having thus describtd my invention, what I claim as new, and desire tosecure by Letters Patent, is-

Forming an external casing or covering of copper for stoves and allheat-diffusing devices or apparatuses and steam-boilers, in the mannerand for the purpose as herein shown and described.

JACOB IIARSHMAN.

\Vitnesses:

GEO. W. HANK, B. F. EAKER.

